What distinctive feature characterizes the cluster fly?

The distinctive feature of the cluster fly is the presence of yellow hair on the thorax, which is a key identifying characteristic. Cluster flies, scientifically known as Pollenia rudis, are often recognized by this feature, along with their relatively larger size and sluggish, uncoordinated flying behavior compared to other common fly species.

Their appearance is further defined by their dull gray color and a somewhat hairy body, with the yellowish hairs on the thorax standing out. This trait helps distinguish them from other flies that may have different coloration or body structures. Understanding these physical traits is crucial for pest control operators as they identify and differentiate between species when managing pest populations effectively.